A crawler tensioning device

Abstract

The present invention provides a crawler tensioning device, which includes a crank arm, a balance elbow and a crawler adjusting mechanism. The crawler adjusting mechanism includes a rotating ring, a connecting ring, a first fixing block, a first rotating joint, a second rotating joint, a balance elbow connecting block, a second fixing block, a lead screw and a fixing bolt. The device works through the crawler adjusting mechanism to realize the rotation of the crank arm, drive the idler wheel to move along an arc, so as to achieve the purpose of adjusting the tightness of the crawler. The device has the characteristics of external tail adjustment of the vehicle, simple structure, large adjustment range, automatic compensation for error / swing angle, and self-adaptation of the adjustment position. It can simply, quickly and reliably adjust the tightness of the crawler outside the vehicle under the constraints of space, structure, etc.

Description

Technical Field

[0001] The present invention belongs to the technical field of track vehicle suspension arrangement and track tensioning, and particularly relates to a track tensioning device. Background Art

[0002] The function of the track tensioning device is to adjust the tightness of the track. For medium and heavy track vehicles, there are no position and space limitations for the layout and structure of the track tensioning device. However, for light and ultra-light vehicles, due to the limited space inside the vehicle, it is impossible to install a screw-type track tensioning device. The traditional screw-type track tensioning device has a large structural size, and the adjustment position is in the middle of the track tensioning device. Limited by the external space of the vehicle and the structure of the running system, the layout structure space of the traditional track tensioning device is severely squeezed, and the track tensioning device is blocked by the running wheel system. If the traditional layout and structure are used, it will be impossible to adjust the tightness of the track. Therefore, it is urgent to study a track tensioning device to meet the use requirements of arranging a track adjustment device in a limited space and enabling simple, fast, and reliable adjustment of the track tightness at the rear of the vehicle outside. Summary of the Invention

[0003] (1) Technical Problems to be Solved

[0004] The present invention provides a track tensioning device to solve the technical problems that, under the condition of limited space structure of light and ultra-light vehicles, it is necessary to meet the requirements of arranging a track adjustment device in a limited space and enabling simple, fast, and reliable adjustment of the track tightness at the rear of the vehicle outside.

[0005] (2) Technical Solutions

[0006] To solve the above technical problems, the present invention provides a track tensioning device, which includes a crank arm, a balance elbow, and a track adjustment mechanism; the balance elbow is used to connect the vehicle body and the suspension device, the crank arm is used to connect the balance elbow and the idler wheel, and both ends of the track adjustment mechanism are fixedly connected to the crank arm and the balance elbow respectively; the crank arm, the balance elbow, and the track adjustment mechanism are arranged in a triangle; wherein, the idler wheel shaft located at the upper end of the crank arm is inserted into the central hole of the idler wheel and connected to the idler wheel through a bearing; the balance elbow connecting shaft located at the lower end of the crank arm is inserted into the crank arm connecting part at the lower end of the balance elbow; the vehicle body connecting shaft located at the upper end of the balance elbow is connected to the vehicle body and the suspension device.

[0007] Further, the track adjustment mechanism includes a rotating ring, a connecting ring, a first fixing block, a first rotating joint, a second rotating joint, a balance elbow connecting block, a second fixing block, a lead screw, and a fixing bolt; wherein,

[0008] The cylindrical part of the rotating ring has an external ring groove structure, and two semi-circular connecting rings are rotationally connected to the rotating ring through an internal ring groove structure that mates with the rotating ring; the two connecting rings are fixedly connected to the crank arm flange located on the outer side of the upper end of the crank arm through a plurality of fixing bolts, and the rotating shaft on the crank arm flange is connected to the rotating shaft mounting hole located on the inner end face of the cylinder of the rotating ring through a bearing;

[0009] The cylindrical outer end face of the rotating ring is provided with a rotating ring connection block, the rotating ring connection block and the first fixing block form a first fixing assembly, a fixing hole is formed in the middle of the first fixing assembly, and the first rotating joint is arranged in the fixing hole of the first fixing assembly; the first rotating joint is fastened between the rotating ring connection block and the first fixing block through a fixing bolt; the balance elbow connection block is fixedly connected to the upper end of the balance elbow, the balance elbow connection block and the second fixing block form a second fixing assembly, a fixing hole is formed in the middle of the second fixing assembly, the second rotating joint is arranged in the fixing hole of the second fixing assembly, and the second rotating joint is fastened between the balance elbow connection block and the second fixing block through a fixing bolt;

[0010] Both ends of the lead screw pass through the first fixing assembly and the second fixing assembly respectively, and are respectively screwed into the first rotating joint and the second rotating joint through threads; the threads at both ends of the lead screw correspond to the threads of the first rotating joint and the second rotating joint;

[0011] Limiting structures are arranged in both the first fixing assembly and the second fixing assembly and between the first rotating joint and the second rotating joint, which are used to limit the self-rotation of the first rotating joint and the second rotating joint when the lead screw rotates, and convert the rotational displacement of the lead screw into a linear displacement of the fixing assembly through the rotating joint.

[0012] Furthermore, a spherical hole is formed in the middle of the first fixing assembly, and the first rotating joint has a spherical structure.

[0013] Furthermore, a spherical hole is formed in the middle of the second fixing assembly, and the second rotating joint has a spherical structure.

[0014] Furthermore, the first rotating joint and the second rotating joint are divided into a left-handed joint and a right-handed joint.

[0015] Furthermore, the surface of the lead screw is electroplated with a tungsten alloy coating.

[0016] Furthermore, external hexagonal adjustment interfaces are designed at both ends of the lead screw.

[0017] (III) Beneficial effects

[0018] The present invention provides a crawler tensioning device, which includes a crank arm, a balance elbow, and a crawler adjusting mechanism. The crawler adjusting mechanism includes a rotating ring, a connecting ring, a first fixing block, a first rotating joint, a second rotating joint, a balance elbow connecting block, a second fixing block, a lead screw, and a fixing bolt. The device works through the crawler adjusting mechanism to realize the rotation of the crank arm, drive the idler wheel to move along an arc, so as to achieve the purpose of adjusting the tightness of the crawler. The device has the characteristics of external tail adjustment, simple structure, large adjustment range, automatic compensation for error / swing angle, and self-adaptation of the adjustment position, and can simply, quickly, and reliably adjust the tightness of the crawler outside the vehicle under the constraints of space, structure, etc. Description of the Drawings

[0019] Figure 1 Schematic diagram of the installation state of the crawler tensioning device according to an embodiment of the present invention;

[0020] Figure 2 Schematic diagram of the overall structure of the crawler adjusting mechanism in an embodiment of the present invention;

[0021] Figure 3 Schematic diagram of the disassembled structure of the crawler adjusting mechanism in an embodiment of the present invention. Detailed Embodiment

[0022] To make the purpose, content, and advantages of the present invention clearer, the following further describes the detailed embodiment of the present invention in conjunction with the drawings and embodiments.

[0023] This embodiment provides a crawler tensioning device, the structure of which is as Figures 1-3 shown, mainly including a crank arm 33, a balance elbow 44, and a crawler adjusting mechanism 55. The balance elbow 44 is used to connect the vehicle body and the suspension device, the crank arm 33 is used to connect the balance elbow 44 and the idler wheel 22, and both ends of the crawler adjusting mechanism 55 are fixedly connected to the crank arm 33 and the balance elbow 44 respectively. The crank arm 33, the balance elbow 44, and the crawler adjusting mechanism 55 are arranged in a triangle. Among them, the idler wheel shaft located at the upper end of the crank arm 33 is inserted into the central hole of the idler wheel 22 and connected to the idler wheel 22 through a bearing; the balance elbow connecting shaft located at the lower end of the crank arm 33 is inserted into the crank arm connecting part at the lower end of the balance elbow 44; the vehicle body connecting shaft located at the upper end of the balance elbow 44 is connected to the vehicle body and the suspension device.

[0024] As Figure 2 and 3 shown, the crawler adjusting mechanism 55 includes a rotating ring 551, a connecting ring 552, a first fixing block 553, a first rotating joint 554, a second rotating joint 555, a balance elbow connecting block 556, a second fixing block 557, a lead screw 558, and a fixing bolt 559.

[0025] The cylindrical part of the rotating ring 551 has an external ring groove structure, and two semi-circular connecting rings 552 are rotationally connected to the rotating ring 551 through an internal ring groove structure that mates with the rotating ring 551. The two connecting rings 552 are fixedly connected to the crank arm flange 331 located outside the upper end of the crank arm 33 by a plurality of fixing bolts 559, and the rotating shaft on the crank arm flange 331 is connected to the rotating shaft mounting hole on the inner end face of the cylinder of the rotating ring 551 through a bearing.

[0026] The connecting ring 552 can ensure the free rotation of the rotating ring 551 while restricting the radial displacement of the rotating ring 551. When the crank arm 33 rotates, the rotating ring 551 can rotate with the rotation of the crank arm 33, always keeping the track adjusting mechanism 55 in an adjustable state, avoiding the occurrence of adjustment swing dead angles, and ensuring that the track adjustment quality meets the use requirements.

[0027] A rotating ring connection block is provided on the outer end face of the cylinder of the rotating ring 551. The rotating ring connection block and the first fixing block 553 form a first fixing assembly, and a spherical hole is formed in the middle of the first fixing assembly. The spherical first rotating joint 554 is arranged in the spherical hole of the first fixing assembly. The first rotating joint 554 is fastened between the rotating ring connection block and the first fixing block 553 by a fixing bolt 559. The balance elbow connection block 556 is fixedly connected to the upper end of the balance elbow 44. The balance elbow connection block 556 and the second fixing block 557 form a second fixing assembly, and a spherical hole is formed in the middle of the second fixing assembly. The spherical second rotating joint 555 is arranged in the spherical hole of the second fixing assembly. The second rotating joint 555 is fastened between the balance elbow connection block 556 and the second fixing block 557 by a fixing bolt 559.

[0028] Both the first rotating joint 554 and the second rotating joint 555 can swing within a certain range in the corresponding fixing assemblies. According to different thread helix directions, they are divided into left-handed joints and right-handed joints to specify the directions of linear displacement of the first fixing assembly and the second fixing assembly when the lead screw 558 rotates.

[0029] Both ends of the lead screw 558 pass through the first fixing assembly and the second fixing assembly respectively, and are respectively screwed into the first rotating joint 554 and the second rotating joint 555 through threads. The threads at both ends of the lead screw 555 are divided into left-handed trapezoidal threads and right-handed trapezoidal threads, which are used corresponding to the first rotating joint 554 and the second rotating joint 555. In order to balance anti-corrosion and strength, the surface of the lead screw 555 is electroplated with a tungsten alloy coating. Both ends of the lead screw 558 are designed with external hexagonal adjustment interfaces.

[0030] The first fixing component, the second fixing component, the first rotating joint 554, and the second rotating joint 555 are all provided with limiting structures for restricting the self-rotation of the first rotating joint 554 and the second rotating joint 555 when the lead screw 558 rotates, and converting the rotational displacement of the lead screw 558 into the linear displacement of the fixing component through the rotating joints.

[0031] In the present invention, the first rotating joint 554 and the second rotating joint 555 are designed as spherical shapes and cooperate with the spherical holes in the middle of the first and second fixing components, which can compensate for installation errors, facilitate disassembly and assembly, and at the same time also have the functions of automatically compensating the swing angle and adapting to the adjusted position.

[0032] When using the device of the present invention to adjust the tension degree of the crawler, a tool is used to rotate the external hexagonal adjustment interface reserved at the tail of the lead screw 558, thereby driving the entire lead screw 558 to rotate. Through the first rotating joint 554 and the second rotating joint 555, the rotational displacement of the lead screw 558 is converted into the linear displacements of the two fixing components, realizing the rotation of the curved arm 33, and further driving the idler wheel 22 to move along an arc, so as to achieve the purpose of adjusting the tightness of the crawler 11.

[0033] The above are only the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present invention, several improvements and deformations can be made, and these improvements and deformations should also be regarded as the protection scope of the present invention.

Claims

1. A crawler tensioning device, characterized in that, The crawler tensioning device includes a crank arm, a balance elbow and a crawler adjusting mechanism; the balance elbow is used to connect the vehicle body and the suspension device, the crank arm is used to connect the balance elbow and the idler wheel, and both ends of the crawler adjusting mechanism are fixedly connected to the crank arm and the balance elbow respectively; the crank arm, the balance elbow and the crawler adjusting mechanism are arranged in a triangle; wherein, the idler wheel shaft located at the upper end of the crank arm is inserted into the central hole of the idler wheel and connected to the idler wheel through a bearing; the balance elbow connecting shaft located at the lower end of the crank arm is inserted into the crank arm connecting part at the lower end of the balance elbow; the vehicle body connecting shaft located at the upper end of the balance elbow is connected to the vehicle body and the suspension device; The crawler adjusting mechanism includes a rotating ring, a connecting ring, a first fixing block, a first rotating joint, a second rotating joint, a balance elbow connecting block, a second fixing block, a lead screw and a fixing bolt; wherein, The cylindrical part of the rotating ring has an external ring groove structure, and two semi-circular connecting rings are rotatably connected to the rotating ring through an internal ring groove structure matching with the rotating ring; the two connecting rings are fixedly connected to the crank arm flange located on the outer side of the upper end of the crank arm through a plurality of fixing bolts, and the rotating shaft on the crank arm flange is connected to the rotating shaft mounting hole located on the inner end face of the cylinder of the rotating ring through a bearing; A rotating ring connecting block is arranged on the outer end face of the cylinder of the rotating ring, the rotating ring connecting block and the first fixing block form a first fixing assembly, a fixing hole is formed in the middle of the first fixing assembly, and the first rotating joint is arranged in the fixing hole of the first fixing assembly; the first rotating joint is fastened between the rotating ring connecting block and the first fixing block through a fixing bolt; the balance elbow connecting block is fixedly connected to the upper end of the balance elbow, the balance elbow connecting block and the second fixing block form a second fixing assembly, a fixing hole is formed in the middle of the second fixing assembly, the second rotating joint is arranged in the fixing hole of the second fixing assembly, and the second rotating joint is fastened between the balance elbow connecting block and the second fixing block through a fixing bolt; Both ends of the lead screw pass through the first fixing assembly and the second fixing assembly respectively, and are screwed into the first rotating joint and the second rotating joint through threads respectively; the threads at both ends of the lead screw correspond to the threads of the first rotating joint and the second rotating joint; Limiting structures are arranged in both the first fixing assembly and the second fixing assembly and between the first rotating joint and the second rotating joint, which are used to limit the self-rotation of the first rotating joint and the second rotating joint when the lead screw rotates, and convert the rotational displacement of the lead screw into the linear displacement of the fixing assembly through the rotating joint; A spherical hole is formed in the middle of the first fixing assembly, and the first rotating joint has a spherical structure; a spherical hole is formed in the middle of the second fixing assembly, and the second rotating joint has a spherical structure.

2. The crawler tensioning device according to claim 1, characterized in that, The first rotating joint and the second rotating joint are divided into left-handed joints and right-handed joints.

3. The crawler tensioning device according to claim 1, characterized in that, The surface of the lead screw is electroplated with a tungsten alloy coating.

4. The crawler belt tensioning device according to claim 1, wherein, External hexagonal adjustment interfaces are designed at both ends of the lead screw.

Images